Timeline of Ann Arbor History and its Tragedies, Crises . . . Timeline of Ann Arbor and Washtenaw County Area History including its many Tragedies, Crises, Disasters, and Shocking News: Pontiac's War in 1763; American Revolutionary War, 1775-1783; the Declaration of Independence was signed on July 4, 1776 by 56 politicians from 13 colonies